Blowtorch



1954 M. A. SILVERMAN ET AL 2,667,214

BLOWTORCH Filed April 8, 1952 IN VE N 7025.

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Patented Jan. 26, 1954 BLOWTORCH Myer A. Silverman and H City, Pa.,

arry H. Sherman, Grove assignors to P. Wall Mfg. Company,

Grove City, Pa., a corporation of Pennsylvania Application April 8, 1952, Serial No. 281,083

2 Claims.

This invention relates to blow torches, and more particularly to those of the type wherein liquid fuel is supplied from a pressure tank to a burner nozzle for atomization.

One object of our invention is to provide a torch structure of the character referred to that can more readily and safely be preliminarily heated or primed for the purpose of setting it into operation, this feature being particularly advantageous at Arctic or zero temperatures.

Another object of our invention is to provide a valve of the needle type that is provided with means for preventing accidental unscrewing thereof to a point at which burning fuel or gas will be discharged toward the operator, through the valve stem opening.

The single figure is an elevational sectional view of our structure.

The torch tank 2 serves as a chamber for containing the liquid fuel under pneumatic pressure as is common in the blow torch art. A hand pump 3 of conventional form, or as shown in our co-pending application Serial No. 280,064 filed April 2, 1952, is employed to create pneumatic pressure within the tank and effect flow of gasoline or other liquid fuel through a conduit 4 that is provided with a wick 5 and a flame-arresting screen 6, as is common in this art.

At its upper end, the conduit communicates with a second conduit or passageway i that is formed in the bottom of the torch head 3, the head being provided with a nozzle-like barrel 9 having holes for inspiration of air for combustion with the atomized fuel that is supplied past a needle valve l2 whose stem is screwthreaded at I 3 into the rear wall of the torch head block.

A passageway 1 has a port 14 that discharges to a drip pan l that is here shown as containing a wick IS. The pan and wick are used in priming or preheating the torch head so as to facilitate atomization of the fuel by the valve 52, particularly at excessive cold temperatures such as are encountered in the Arctic regions.

Liquid fuel is supplied to the pan by dropping into place a baffle plate 11 for a brief period, with the valve I2 partly opened, so that there will be feed of fuel from the tank 2 into the passageway 1 and through the port It. It will be possible to supply this priming fuel without opening the valve, but owing to the small size of the port it, considerably more time would be required. Also, the baflie prevents blowing of atomized fuel from the forward end of the nozzle 9 during preparation for priming.

At any rate, when the priming fuel has burned down and the torch head warmed, the bafiie plate I 1 will be slid upwardly out of place, and the valve I 2 opened to the desired extent. The

atomized fuel can then be ignited through one of the air inlets 10. The suctional force when the torch is in operation will prevent any substantial amount of fuel flowing down through the port M.

In order to prevent accidental withdrawal of the valve I2 out of screw-threaded engagement with the body, with consequent danger of backfiring that would injure the operator, we provide an annular shoulder I8 on the valve stem, which, when a stop screw I9 is screwed into a recess 20, will prevent withdrawal of the valve to a greater distance than required for normal operation of the torch.

We claim as our invention:

1. The combination with a fuel receptacle that functions as a pressure tank for supplying a torch head, and a conduit leading therefrom, of a barrel forming part of the torch head and extending forwardly, a rearWardly-extending passageway affording communication between the conduit and the rear end of the barrel, a valve controlling flow from the passageway into the barrel, a baffle member for removably closing the forward end of the barrel, to produce back pressure in the barrel, when the valve is opened, and a drip pan below the passageway and the barrel, for receiving priming fuel from the passageway, the passageway having a bleed port that discharges into the drip pan.

2. The combination with a fuel receptacle that functions as a pressure tank for supplying a torch head, and a conduit leading therefrom, of a barrel forming part of the torch head and extending forwardly, a rearwardly-extending passageway affording communication between the conduit and the rear end of the barrel, a valve controlling flow from the passageway into the barrel, a baffle member for removably closing the forward end of the barrel, a drip pan below the passageway and the barrel, for receiving priming fuel from the passageway, the passageway having a bleed port that discharges into the drip pan, and the barrel having air-inlet openings at points between its rear end and the baffle and at points above the pan.

MYER A. SILVERMAN. HARRY H. SHERMAN.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,676,352 Rueckert July 10, 1928 1,711,571 Martin May 7, 1929 1,730,648 Diener Oct. 8, 1929 1,896,782 Meyer Feb. 7, 1933 1,915,141 Wiley June 20, 1933 1,919,945 Huffman July 25, 1933 

